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We evaluate the generation of magnetosonic waves in differentially rotatingmagnetized plasma. Differential rotation leads to an increase of the azimuthalfield by winding up the poloidal field lines into the toroidal field lines. Anamplification of weak seed perturbations is considered in this time-dependentbackground state. It is shown that seed perturbations can be amplified byseveral orders of magnitude in a differentially rotating flow. The onlynecessary condition for this amplification is the presence of a non-vanishingcomponent of the magnetic field in the direction of the angular velocitygradient.

Stretching of the toroidal field and generation of magnetosonic waves in differentially rotating plasma